This filter is just awesome. I own the AirpuraV600 and I bought a few of these filters hereon Sylvane. The filter is great. The amount ofdust and particles floating around has been greatlyreduced. My allergy symptoms are kept to a minimumnow. Before this I was using another air purifier(with a different HEPA filter) and I can't eventell you how great this one compare vs. the other.I have been using the unit for over a month now andI have seen an excellent performance; I haven't shutdown the unit ever since. I'm glad I own this product.I won't hesitate to re-order this again from this website. Excellent quality and great service fromSylvane. I'm a happy camper!